The Book of Ascension to the Essential Truths of Sufism is a lexicon of Sufic terminology compiled by the Moroccan scholar and mystic, Ahmad ibn 'Aji¯ba. It was first begun around the time he entered the Darqawi¯ Order at the hand of its founder, in 1208/1793, and then re-written twelve to thirteen years later after he himself had travelled the Path and became one of its teachers.
The final work, dated 1220/1806 contains 143 Sufic terms for which Ibn 'Aji¯ba gives succinct but profound definitions, usually including what the term means for someone at the beginning, middle, and end of the spiritual journey.
 
The main text is enriched by twenty more passages from other works by the same author as well as by the complete text of al-Mir?a¯j in vowelled Arabic text,  extensive notes, and indices of persons, terms, Quranic verses, and h?adi¯th mentioned.